CollationKeyFilter
converts each token into its binary CollationKey using the
provided Collator, and then encode the CollationKey
as a String using
IndexableBinaryStringTools, to allow it to be
stored as an index term.

Atomically deletes documents matching the provided
delTerm and adds a block of documents, analyzed using
the provided analyzer, with sequentially
assigned document IDs, such that an external reader
will see all or none of the documents.